How can i make an xy position to loadMovieNum

how can i make an xy position to loadMovieNum.?

my code:

loadMovieNum(“myFile.swf”,1);

…and to position it…:

_level1._x=200;
_level1._y=200;

the question:

the position does not WORK in my swf.!!!

why?
where do i have to put the position code?
what do i have to do?